What is the mass of 3.01 x 10²² molecules of carbon dioxide at STP?

Question

using dimensional analysis

Answer 1

Using dimensional analysis:

3.01x10²² molecules CO₂ x 1 mol CO₂/6.02x10²³ molecules x 44. g CO₂/mole = 2.20 g CO₂

Answer 2

this is going to involve multiply conversions in order to convert it over! first you want to divide by Avogadro's number to convert over into moles, then once you have that you can multiply by the molar mass of CO₂ to find the mass

3.01 x 10^22 molecules x (1 mole 6.022 x 10^23 molecules) x (44.01 grams / 1 mol) = 2.199 g

meaning that the mass of 3.01 x 10^22 molecules of carbon dioxide is 2.20 grams